Borne



UNITED STATES PATENT OFFICE.

WILLIAM D. OSBORNE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO ALBERT B. SLOANAKER, OF SAME PLACE.

PROCESS OF PRODUCING, EMBELLISHING, AND RETOUCHENG PHOTO-NEGATIVES.

SPECIFICATION forming part of Letters Patent No. 228,380, dated June 1, 1880. Application filed November 24, 1879.

To all whom it may concern: adhesive substance, is the best adapted to the Be it known that I, WILLIAM DIXON Ospurpose. BORNE, of Philadelphia, in the county of Phil- I am aware that on a glass plate having adelphia, in the State of Pennsylvania, have prepared thereon the engravers black etching- 5 discovered and invented a new Process for ground a spectrum has been formed by a cor- Producing and Improving Photographic Negrect ruling-machine with diamond or other atives; and I do hereby declare that the fol- I point and suitable edges, guides, or patterns, lowing is a full, clear, and exact description for the purpose of producing line-engravings thereof, sufficient to enable any one skilled in from transparent photographs.

0 the art to make and use the same. I am also aware that plain smoked-glass My discovery and invention consists of a plates have been known and used in astrono- 6o process for making a photo-negative or immy for the observation of an eclipse; that a provingand embellishing some other such negsmoked glass has also been used, with the aid ative from which photographs are taken in any of a pantograph or artificial human ear, for

15 of the usual methods. The negative may be the purpose of visibly indicating the vibra- "ormed on the usual plateglass or other transtions produced by the human voice; also, to

parent material used for that purpose. visibly indicate the pitch of musical tones In carrying my process into effect I take a by means of the vibrations of the tuning-fork.

photo-negative plate and smoke it over a gas- I do not claim a plain smoked glass to re- 20 burner or lamp until it has formed a suiiicient ceive tracings, broadly 5 but deposit of soot to enable me to draw thereon. \Vhat I do claim as new, and desire to se- I then sketch the design in negative form cure by Letters Patent, is upon the prepared surface with a brush or 1. As an improvement in the art of photogeraser, after which I again smoke it and work raphy, the method described of softening or 25 up the design which I have sketched, and so toning down negatives, and at the same time repeat the smoking and working until I have adapting them for retouching to cure original 7 5 the strength andcontrast I desire. To predefects of the subject, or making changes in serve permanentlythe design thus drawn on form, figure, or attitude of the same, and also the photo-negative the surface is coated with for the artistic production of scenic eifects,

0 a gum-varnish made from gum dissolved in and which consists, essentially, in depositing benzine or turpentine. The negative is then on the surface of the plate, by means of smoke complete and ready for printing from in the generated from the burning of gas, naphtha, usual manner of photo-printing. kerosene, or other of the hydrocarbons, a coat- By this means I can improve and embellish ing of soot, lamp-black, or other suitable car- 5 any photo-negativetakenin the usual manner; bonaceous deposit, substantially as and for and, further, with brushes and eraser-s I can purpose'hereinbefore specified. 8 5 correct any imperfection,improve the lights 2. A photo-negative having the ordinary and shades, and make any addition or alterasilver or other picture upon it, and provided tion that I may desire, such as draw hair on further with a smoke-deposit of variable thick- 0 the head, sharpen the features, tone down any ness to retard or otherwise regulate the transobjectionable lights, all of which can be done mission of light through it, and having fur- 0 in such a manner as to harmonize thoroughly thermore delineated upon its smoked surface with the rest of the image. It is then varan artistic design in the way of background nished and ready for printing. protected by a transparent preservative coat- 5 It is preferable that the original negative be ing, substantially as described.

taken on amedium-tint plain ground when a WILLIAM DIXON OSBORNE. scenic background is to be added. WVitnesses:

Thedepositfrom the smoke of gas or naphtha, J. It. BROWN, being more free from oily, gummy, and other A. W. HOORADY. 

